package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.PrintWriter;
import java.time.LocalDateTime;
import java.util.List;

/**
 * @author yangLiHua
 * @version 1.0
 * @DATE 2023-11-23 14:39:41
 */
@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车数据
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);

        // 查询自己购物车的商品
        shoppingCart.setUserId(BaseContext.getCurrentId());

        // 判断商品是否在购物车内
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);

        if( shoppingCartList != null && shoppingCartList.size() == 1){
            // 如果该商品存在于购物车中
            shoppingCart = shoppingCartList.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber()+1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }else {
            // 如果商品或者套餐没有在购物车中,插入数据，数量为1

            // 先查看是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId!=null){
                // 是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                // 是套餐
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }

            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }

    /**
     * 查看购物车数据
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
        return shoppingCartMapper.list(ShoppingCart
                                .builder()
                .id(BaseContext.getCurrentId())
                .build());
    }

    /**
     * 清空购物车
     * @return
     */
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }
}
